Deputy Minister of Public Security Tran Dai Quang held a reception for British Minister of State at the Foreign and Commonwealth Office, Jeremy Browne, in Hanoi.
Japan was rattled by a strong aftershock and tsunami warning nearly a month after a devastating earthquake and tsunami flattened the northeastern coast.
European finance ministers face a point of no return as they gather in Hungary for talks derailed by Portugal's sudden admission it needs an emergency bailout.
Portugal said it had finally decided to request financial assistance from the European Union, paving the way for a third bailout of a eurozone country.